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26 August 2005 Generation of spiral optical beams using a spatial light modulator
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Recently, a new type of beam termed "spiral optical beam" has been introduced [Alonzo, et al., Opt. Express 13, 1749 (2005)]. Spiral beams are created from multiplicative mixtures of helical and conical phase distributions. Helico-conical phase fronts that generate these novel beams are not achieved with a sequence of a corkscrew wave-plate and an axicon (as this sequence gives a sum of helical and conical phase terms). Nevertheless, the availability of phase-only spatial light modulators (SLM) allows one to directly imprint helico-conical phase functions on an incident plane wave and provides an easy way to modify the profile of the encoded phase. Focusing the phase-modified field results in spiral intensity distributions that may find use for optical manipulation of mesoscopic particles. In this paper, we have extended the discussion to translation and rotation (as well as chirality switching) of the spiral beams using SLM control.
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Peter John Rodrigo, Carlo Amadeo Alonzo, and Jesper Gluckstad "Generation of spiral optical beams using a spatial light modulator", Proc. SPIE 5930, Optical Trapping and Optical Micromanipulation II, 59301W (26 August 2005); doi: 10.1117/12.615659;

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